Multi-jet dynamics in lepton-induced reactions and calorimetry as a tool for analysis

It is discussed how calorimeters with a granular structure can be used quite efficiently to probe the hadronic final state in lepton induced reactions for the existence of a hierarchy of jet-like events: 2 jets, 3 jets etc. Predictions for the energy spectrum derived in a perturbative treatment of QCD to lowest non-trivial order are presented. By this method one can also isolate the effect of intrinsic p_⊥ of partons inside the nucleon from p_⊥ which is generated in the scattering process via hard gluon bremsstrahlung.